Abstract The inner structural properties of two different types of magnetic fluids (MFs) under the application of an external magnetic field were experimentally investigated by using the ultrasonic propagation velocity method. Because the inner structure of the MF subjected to an external magnetic field mainly depends on parameters such as the medium, particle–particle interaction, and hysteresis, the ultrasonic velocity method was used to investigate the detailed structural formation of particles in both polar and non-polar medium based MFs. The experimental data were analyzed by incorporating the distribution of the particle moments by using Tarapov’s theoretical model. Based on the results, the inner structures of the prepared MFs were analyzed in terms of the effect of the medium, while the effects of Brownian mechanism and interaction phenomena in the presence of the external magnetic field were considered. In addition, the results presented reveal anisotropy and hysteresis in the MFs subjected to the external magnetic field.

中文翻译：

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基于极性和非极性介质的磁流体中的粒子相互作用能和磁滞

摘要 采用超声传播速度法，实验研究了外磁场作用下两种不同类型磁流体（MFs）的内部结构特性。由于外磁场作用下 MF 的内部结构主要取决于介质、粒子间相互作用和磁滞等参数，因此采用超声速度法研究了粒子在极性和非极性中的详细结构形成。基于极性介质的 MF。利用Tarapov的理论模型，结合粒子矩的分布，对实验数据进行了分析。在此基础上，从介质的影响方面分析了制备的 MFs 的内部结构，同时考虑了外磁场存在下布朗机制和相互作用现象的影响。此外，所提供的结果揭示了受外部磁场影响的 MF 的各向异性和滞后。